Diamond Coated Trimmer Wheel 12” and 10” Diameter Thickness: 5/16" (7.5 mm) Center hole diameter : 1" Coarse Grit. Compatible with most model trimmers with 12" diameter wheel. Premium quality diamond trimmer wheel. Your satisfaction is guaranteed. With embedded diamonds cuts faster, smoother and quieter than regular trimming wheels. Lasts longer than regular trimming wheels. Solid sturdy aluminum backing. Will not rust or bend. Self cleaning. Please make sure about the wheel diameter and thickness of your trimmer before you order.