Sturtevant Richmont Square Drive head 1/4in drive, max torque 250 in. lbs.
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Sturtevant Richmont Interchangeable Heads - Square Drive head 1/4" drive size, max torque 250 in. lbs., Dimensions A = 1 23/32", B = 9/16", C = 3/4", D = 3/4", E = 11/16" (see image)PN819057