Diameter : UPTO 340 MM Machine Relieved & Ground Form Gear Hobs are supplied to cover the Range of 64 DP to .7 DP or 0.5 Module to 36 Module conforming to DIN 3968, BS 2062 part 1. Special profile Hobs with protuberance, Topping, Semi Topping pre-shaving, pre-grinding are also being supplied on request