SCREW - R4 MULTI-PURPOSE - #10 x 4" HANDY-PAK T25 (GRK #02141 or #103141) | #6 and #8 screws use T-15 bit; #9, #10, and #12 use bit T-25. Self-tapping, countersinking head; W-Cut thread design. Climatek coated for all weather corrosion protection conforms with ICC#2442. For use in wood, particle-board, cement fiberboard, plastic, and sheet metal.