Uxcell a14041800ux0341 Socket Adapter Set 1/4" Hex Shank to 1/4" Impact Driver/Drill (Pack of 5) Uxcell (u excel !) is the sole authorized seller of Uxcell products Product name: socket adapter; material: chrome vanadium steel; hex socket size: 6.3Mm/ 1/4"; hex shank size: 6.3Mm/ 1/4" Overall size: 6.5 x 50Mm/ 0.25" x 2" (d*l); color: gray