Reducing Bushing Adapters for Bench Grinding Wheels (1/2", 5/8", and 3/4" Arbors) (1/2"-1"x1/2" (3)) Three reducing bushing adapters for 1/2-inch wide bench grinding wheels up to 1" hole diameter Can be used with 1/2", 5/8", and 3/4" arbors and wheel hole size 1" High precision machining to decrease wheel off-balancing and minimize wobbling Made of heavy duty VG-10 stainless steel Lifetime warranty; will not deform, degrade or develop cracks as plastic adapters