10-20mm Digital Inside Caliper 5-25mm 30-40mm Electronic Gauge with Rotatable Dial Measuring Bore Groove Absolute Measurement - AliExpress
Arlen Ness Front 6 Piston Differential Bore Caliper For Harley With 11.8" Rotors 2006-2023 - Cycle Gear
GM Large Bore Single Piston Calipers - Pair | johnnylawmotors.com
Inner Vernier Calipers, Inside Groove Vernier Caliper, Double Claw Inner Groove Vernier Calipers Made of Carbon Steel for Measuring The Diameter of The Bore(9-200mm): Amazon.com: Industrial & Scientific
Digital Internal Bore Caliper ranging from 19-150 mm(3/4-6 in)
Performance Machine Contrast Cut™ Four-Piston Differential-Bore Front Caliper for 11.5" Rotors