Features
1.4 converter kits
2.This kit allows you to mix and match drive sizes for sockets, ratchet handles, extensions and other accessories.
Ideal tool for mechanics, engineers, carpenters or DIY enthusiasts
Spring ball bearing accessory holder
Hardness: 60HRCMade from Chrome vanadium steel

Size
1/2 "to 3/8" - (12.5mm square hole to 9.5mm square head) Length: 36mm 
3/8 "to 1/4" - (9.5mm square hole to 6.3mm square head) Length: 26mm 
3/8 "to 1/2" - (9.5mm square hole to 12.5mm square head) Length: 35mm 
1/4 "to 3/8" - (6.3mm square hole to 9.5mm square head) Length: 25mm