3/8 Inch Drive Triple Square Impact Bit Socket Set with Rail, 8-Piece (M4-M12) BoltsandNuts.com and three have a 1/4

and three have a 1/4 inch shaft diameter

Shank Size: C

Size 1-3/4"-8

Part Number: 87C800HCSSS

Part Number DWTMR2-12X1

3/8 Inch Drive Triple Square Impact Bit Socket Set with Rail, 8-Piece (M4-M12) BoltsandNuts.com and three have a 1/4Precise Triple Square Geometry The triple square (also called XZN) tip is machined to precise tolerances Optimal Two Piece Design We use separate steel alloys and processes for the bit and socket, resulting in a higher performing tool than one piece designs Permanent Connection The bit is pressed directly into the socket for a permanent connection that won't loosen over time or under stress Two Size Markings The size is marked with a high visibility