V-blocks are available in three sizes: 1", 2", and 3". 1" v-blocks stage parts from 3/32" to 1" (2 to 25 mm) in diameter. 2" v-blocks stage parts from 7/32" to 2" (5 to 50 mm) in diameter. 3" v-blocks stage parts from 1/2" to 3" (12 to 75 mm) in diameter.