The CHAMPRO in-ground dual-stanchion anchor system allows for quick removal of a CHAMRPO dual-stanchion pitching rubber or double first base. It’s made of durable steel to endure traffic on the ball diamond. The “official size� fits the CHAMPRO Official Size Pitcher's Rubber, which measures 6"x24�. The “youth size� fits the CHAMPRO Youth Size Pitcher’s Rubber, which measures 4�x18�. The Official Size is also compatible with the CHAMPRO Pro-Style Molded Double First Base. This is the replacement anchor system ONLY. It does NOT include the pitching rubber.