Item:Slip-Fixed/Renewable Drill Bushing (Sf); Drill Bushing Wall Type:Standard Wall; Head Type:Yes; Measurement System:Letter; Inside Dia.:R; Decimal Equivalent:0.3390; Drill Size:R; Inside Dia. Tolerance:+0.0001 In /+0.0005 In; Outside Dia.:1/2 In; Outside Dia. Tolerance:-0.0002 In /+0.0000 In; Bushing Code:Sf; Bushing Head Type:Headed; Overall Length:3/4 In; Head Dia.:51/64 In; Head Material:High Speed Steel; Heat Treatment:Through Hardened; Material - Machining:High Speed Steel; Rockwell Hardness:Rc 62-64;