Chamfering inner corners Contains one 90conical bit and one 3mm spherical bit. While the conical bit is designed for modifying through holes or deeper countersunk holes, Selected raw material Both conical and spherical bits are constructed from forged tungsten steel.Greater sharpness ensures more satisfying results. Four-jaw chuck The four-jaw chuck design provides more positive grip of bits and prevent them from slipping during operation. Chamfering outside corners Contains two sets of blades that make 90or 60 outside corner chamfering for plastic rods/pipes with a diameter smaller than 6mm. Crisscross arrangement The crisscross arrangement of the four chamfering blades ensures stability of plastic rods and even,consistent beveling of the C ridge. Color: As Shown Material: Metal Package Contents: 1*Plastic Chamfering Tool set 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.