This Drill Bit is designed for wood / plastic cutting. It is made of Carbon Steel&BI-Metal Heavy Duty Steel, Durable and Rust-proof. 6 inches hole diameter suits for Corn hole board Drilling and other home projects when cutting 6 inch diameter holes through Wood or Plastic. Non-binding clean edge design make blade cuts and fast.More than that,the spring on the drill bit is because it automatically pushes the disc out of the saw immediately after completing the hole. It is OK for drilling as clockwise rotation, not anti-clockwise. Color:blue Material:metal Size:152MM Package Contents: 1x hole opener 1x post 1x wrench 2x drill bits 1x cartons Only the above package content, other products are not included. Note: Light 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.