Package includes:200pcs Screw Cup Washers 70pcs No.6 hole diameter 4mm, external diameter 11mm 50pcs No.8 hole diameter 5mm, external diameter 13mm 40pcs No.10 hole diameter 6mm, external diameter 15mm 40pcs No.12 hole diameter 6.5mm, external diameter 17mm For use with countersunk wood screws and self tapping screws. All of Washers Will Be Packed in A Sturdy Transparent Plastic Case, Easy to Store and Carry Prevents a nut, bolt or screw from pulling through the material, finish washers are designed to accommodate the heads of a countersuck screw. Material 304 Stainless steel Sizes #6, #8, #10, #12 Quantity 200pcs Brand Unbranded/Generic MPN TJ614608768950 EAN 0614608768950 .