[Full Ball 303-4603]

[Half Ball 303-4601]

Gauge Ranges: 0.125-0.200", 0.200-0.300", 0.300-0.400", 0.400-0.500"
Overall Length: 3-5/8", 3-7/8", 4", 4-1/4"
Probe Depth: 0.880", 1.200", 1.600", 1.600"
Half Ball Type
4 pc set
Knurled knob at end of handle adjusts gauge to hole size
Reading is obtained by measuring over contact points with a micrometer
Gauging surface is hardened, and full round with a flat bottom