1pc The diameter:3/8"(9.5mm),the shank is 1/4" hex
1pc The shank size:3/8"(9.5mm)
the 1/4" hex shank works with any quick change chuck.
Package Includes:
2pcs x Twist Step Drill Bit
2pcs x 6-Inch #2 Square Driver Bit
2 x Stop Collar
2 x Wrench
Christmas Gift for Dad/Father,Husband, Boyfriend, Men,DIY Handyman