Here we have a Central Tools 6453. A Disc brake rotor thickness gauge.
Central Tools 6450 Disc Rotor/Ball Joint Gauge Set
Vintage NOS still in the box Central Tools 282 Disc Rotor/Ball Joint Gauge Set
Sold Central Tools Disc Rotor And Ball Joint Gage No.6450. Comes In Protective
0.3"-1.3" Pointed Anvil Disc Brake Micrometer Accu-Turn Central Tools# 6202
Central Tools 6202 0.300"-1.300" Disc Brake Micrometer with case