6g 8g 10g 12g ELECTRO BRASS SCREW CUP WASHERS FOR COUNTERSUNK SCREWS & BOLTS
No.6 fits both No.6 countersunk screws or an M3.5 countersunk bolt. No.8 fits both No.8 countersunk screws or an M4 countersunk bolt. No.10 fits both No.10 countersunk screws or an M5 countersunk bolt.