Go by the units in the service data you use. Metric sets on the page have 10, 13, 15 or 20 blades and imperial sets 10, 13 or 26 blades. Dual marked sets, with blade counts including 12, 25, 26, 32 and 35, show both units on each blade, which saves converting when your data mixes the two.
More blades mean smaller steps between thicknesses and a wider span of gaps you can check. Sets on the page run from 10 to 36 blades, and one 15 blade metric set is listed as covering 0.06 to 0.70mm. Check that the thicknesses you set most often are included before choosing a smaller set.
Offset blades are cranked near the tip so they slide into a gap you cannot approach in a straight line, such as a valve clearance tucked beside other components. The page lists 12 and 26 blade offset dual marked sets, a 12 blade angled tappet gauge, and longer options including a 300mm 25 blade set.
Brass is non-magnetic, so a brass blade is used for gaps next to magnets, such as ignition pickup air gaps, where a steel blade would be pulled sideways and give a false feel. The page lists a 36 blade combination set with both steel and brass blades, dual marked.
Measure the diameter of the filter canisters you service. Removers on the page are listed for 66-100mm and 110-155mm, and there are adjustable and heavy duty versions as well. A heavy duty strap wrench is also listed, which wraps around a round housing instead of relying on a set jaw size.
It helps you pinpoint the source of a knock, tick or whine by placing the probe on different parts of a running engine or drivetrain and listening for where the noise is loudest. The page lists a standard mechanic's stethoscope and an electronic stethoscope with headphones, which amplifies the sound.
Automotive Engine Service Tools
Automotive Engine Service Tools covers feeler gauges, oil filter removers and related engine service tools. The feeler gauge range covers metric, imperial and dual-marked sets from 10 to 36 blades, including offset, extra-long and angled tappet gauges for checking valve clearances and component gaps. The section also lists oil filter removers in several size ranges, mechanic's stethoscopes and a freeze and release spray lubricant for freeing seized fixings.
Brands include Sealey, Draper and Sykes Pickavant. When selecting a feeler gauge, match the marking to the vehicle data you work from, whether metric, imperial or both, and consider blade count and length: longer or offset blades help where access to the valve gear is restricted. For oil filter removers, check the stated diameter range against the filter sizes you service.
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