All American Drill Bushing 1/2" ID x 1" OD x 1" L; SFX Slip/Fixed Renewable,OD x 1" L; SFX Slip/Fixed Renewable All American Drill Bushing 1/2" ID x 1", SFX bushings combine the benefits of older S-type slip-renewable and F-type fixed renewable bushings: one side of SFX drill bushings feature a lockscrew recess for fixed mounting; the other has a locking recess that allows the bushing to slip down, then rotate to lock in place,Details: SFX drill bushings are replaceable bushings generally used with a liner bushing and lockscrew, 1" OD x 1" L; SFX Slip/Fixed Renewable All American Drill Bushing 1/2" ID x.