General description Specially designed for precision woodworking, this 1/5pc 8mm Shank HSS Wood Router Bit Set includes a 2.8mm x 8mm spiral wood cutter made from durable molybdenum steel. The set features a rear sleeve disc hole for cabinet plush pilot holes, allowing for easy depth adjustments. Technical specifications Shank diameter: 8mm Spiral cutter size: 2.8mm x 8mm Material: Molybdenum steel Usage Designed for drilling and disc holes that can be used with wood screws without the need to change bits. Hole length can be adjusted for different lengths of screws by loosening or tightening the set screw.