Also popular by professionals. Brown color is now available in the Consistent Penetration series. Flexible head with high low screw specifications, screw tip special processing for outstanding propulsion. Made of SUS410 stainless steel, so it is rust resistant even when used outdoors, and it boasts an outstanding input with a 0.18 inch (4.5 mm) diameter type with special tip processing. It can be pushed without a hole so you can shorten the installation time. 1 box (approx. 150 pieces) *Includes 1 square bit (#2) Color: Brown; Screw size: Φ0.18 x 3.0 inches (4.5 x 75 mm); Optimum hole drill diameter: 0.14 inches (3.5 mm).