Allstar Performance ALL18663 Black 1/4" x 1" Countersunk Washer, (Set of 10) Go to amazon.com Related posts The 8 best countersunk washer FeatureCountersunk Washer1/4 in ID1 in OD DescriptionAllstar Performance 18663 Countersunk Washer Blk, 1/4in x 1in 10pk