Spark Plug Gap Tool, Universal Gapper with 32 Blade Steel Feeler Gauge, Thread Plugs Compatible for Most 10mm 12mm 14mm 16mm (Red) Red+Feeler Gauge -

Gapping a plug by tapping it on a bench is how electrodes get knocked out of square and centre insulators get cracked. This gapper holds the plug and closes the side electrode against a knob, with a 32-blade feeler set alongside it so the measuring and the adjusting happen with one tool in your hand.

It closes a gap. It will not open one

The supplier is direct about this and it is the most useful line in the whole listing: the tool will only close a gap, never open it. So the working method is to check first, and only reach for the gapper if the gap reads wide. If it reads narrow, this is not the tool that fixes it. The supplier also notes that some electrodes spring back a little after being pressed, which is normal for certain plugs, and suggests selecting a feeler slightly under your target rather than exactly on it. Whatever that target is, it comes from the engine's own specification — nothing on this page states a gap for any vehicle, and no listing should.

The feeler set is the half that gets used every service

Thirty-two blades, per the title, dual marked in imperial and metric, with a published range of 0.001 to 0.04 inch (0.03 to 1 mm). Dual marking matters more than it sounds: an engine specified in millimetres and a gauge marked only in thousandths of an inch is how mistakes get made at the bench. The blades are described as hardened and polished for accuracy over a long life. The material is given inconsistently — stainless steel in one line, flexible 65 manganese steel in another — and both are printed in the specifications rather than picked between.

Which plugs the supplier says it takes

Stated compatibility is most 10 mm, 12 mm, 14 mm and 16 mm standard spark plugs, along with the short thread depth plugs found in chainsaws, line trimmers and other small engines. The supplier then rules out 18 mm threads, and in the same breath rules out long reach and short reach plugs — which sits awkwardly beside its own claim about short thread depth. Both statements are reproduced below. Measure your plug's thread before ordering rather than working from the engine's name.

Key features

• Screw-knob action: the electrode is closed under control instead of being tapped.
• 32 blades: per the title, covering 0.001 to 0.04 inch.
• Dual marked: imperial and metric on the same blade.
• Four thread sizes: 10, 12, 14 and 16 mm, as stated.
• Small-engine use: the supplier names chainsaws and line trimmers alongside cars.

Specifications

• Feeler blades: 32, per the product title
• Measurement range: 0.001 to 0.04 inch (0.03 to 1 mm), as published
• Blade material: given as stainless steel in one line and 65 manganese steel in another; both printed as supplied
• Blade finish: hardened and polished
• Plug threads stated: 10 mm, 12 mm, 14 mm, 16 mm
• Excluded by the supplier: 18 mm threads, and long reach and short reach plugs
• Function: closes a gap only
• Colour: red; one version is stocked
• Tool dimensions and weight: not published

Before you use it

• The gap belongs to the engine, not to the tool. Work to the figure in your vehicle or equipment manual and to nothing else.
• The supplier does not distinguish between plug types. Fine-wire and precious-metal plugs — iridium, platinum and similar — have delicate centre electrodes that a wedge or coin-style gapper can damage or knock off entirely, and many are supplied pre-gapped. Check what you are holding before applying any pressure to it.
• The compatibility statement contradicts itself on reach. Confirm your plug's thread size and reach against the list above rather than assuming.

A gauge you will use at every service, and a gapper for the one direction it actually works in.

Returns, Refunds, and Replacements

Products that are received faulty, damaged, or not as described are eligible for a return, refund, or replacement in accordance with the Australian Consumer Law (ACL). We are committed to ensuring all products meet the standards of quality and reliability expected by our customers. However, please note that we do not accept returns or provide refunds for change of mind. We encourage you to carefully consider your purchase to ensure it meets your needs and expectations.

Delivery Timeframe

Please note that we cannot guarantee the exact date of arrival, and the delivery timeframes (excluding weekends and public holidays) are as follows:

For customers in Victoria, approximately 7-10 working days;
For customers in NSW, SA, ACT, and QLD, approximately 9-12 working days;
For customers in WA, NT, and TAS, approximately 9-12 working days.