the tool ( SBHA) can be used on straight shank, for example :
boing bar, u drill, twist drill, center drill and extension rod
Eg: SHB 16 - 3/4/5/6/7/8 Bushing OD: 16mm , ID: 3/4/5/6/7/8mm
SHB 20 - 3/4/5/6/7/8/10/12 Bushing OD: 20mm , ID:3/4/5/6/7/8/10/12mm