Bought this awhile back. Essientially just like worlds finest trimmer but it's micro adjustable. Has housing with an end mill inside and simply chuck up in a hand drill. Has 300 wsm bushing, 308 bushing and 7mm rem mag bushing. The bushings index off the shoulder so most bushings will accommodate that cartridge family. Very fast and accurate trimmer 100 shipped for all of it. This uses same bushings as worlds finest trimmer so other bushings are readily available.