Solid Carbide spiral router bit with 4 mm and 4mm cutting diameter,16mm cutting length, 75mm for total length For Plywood, OAK, MDF, and any hardwood working and Long service life for sharp Spiral bits used for smoothly upcut groove and slots, Mortises, Cycles and dados leave with clean edge and top surface, straight bits The route bit suit for CNC router and , , and any brand plunge router with 4mm inch collet Industrial quality control to best performance Colour:Silver Material:Tungsten steel Size:6x25x6x75mm Package Contents: 5 x spiral router Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.