Freud 4-7/16" (Dia.) Performance System Rail and Stile Door System with 1-1/4" bore (RS1000) Contains cutter heads (RS-S & RS-R), groover knives for head RS-R (RS-K), back tenon knife for head RS-S (RS-L). Combines the flexibility of standard insert tooling with the performance of resharpenable TiCo Hi-Density Carbide knives Ideal for making cabinet doors with perfect tenon joints even after sharpening Features eased panel slot edges to prevent splintering and improve finishing