Online Parts Store › Stainless Countersunk Finishing Washer, #4 Image 1 of 1 Stainless Countersunk Finishing Washer, #4 $13.29 316 Stainless Steel. Add To Cart Added! 316 Stainless Steel. You Might Also Like Phillips Tapping Screws - Oval Head, #12 x 1-1/4" $22.30 Square Tapping Screw - Flat Head,#10 x 1-1/2" $62.54 Seachoice 01013 Lock Washer, 3/8" $58.45 Phillips Tapping Screws - Oval Head, #10 x 1-1/4" $28.85 Stainless Fender Washer #10, .062" Thick, OD 1" $48.06