The 9 Piece Manual Brake Gauge Set Allows Brake Pad Wear to be Accurately and Consistently Measured without Guessing. the 9 piece manual brake gauge set allows brake pad wear to be accurately and consistently measured without guessing. designed to check both straight on or at a 90° angle to the rotor with offset tips. brake lining gauges identify thickness levels for brake lining inspection. "made from durable, flexible acetal. includes 22mm (.8661"), 20mm (.7874"), 18mm (.7087"), 16mm (.6299"), 14mm (.5512"), 12mm (.4724"), 10mm (.3937"), 8mm (.3150") and 6mm (.2362")." Fit type: Universal Fit