1.The button bit we got the Tapered button bit and the threaded button bit , Button Bits with threaded connection and tapered connection a. Tapered Button Bits: Dia: 1-1/4 to 1-7/8, Degree: 6, 7, 11 or 12 b. Threaded Button Bits: Dia: 1-3/4 to 4-17/32 Connected thread: R25, R32, R38, T38, T45, T51 Button Bits 1. Tapered Button bits(7,11,12Degree), Diameters:32mm-50mm, Tips type:4tips or 7tips or 8tips, Button or Ballistic tips 2. Thread button bits, Diameters from 45mm-102mm, Thread Type: R32,T38,T45,T51 Thread Tip type: Button or Ballistic tips, Face type: Flat face or drop center. Code bit dia buttons taper water hole MM guage front angle A 32~42 38 18 25 7 2 B 32~38 38 18 25 7 3 C 40~42 38 18 30 7 3 D 45~51 48 28 30 7 3 E 41 510 27 35 7 3 F 45~51 511 28 35 7 3.