#12 x 15mm Sealing Washer. 20 gauge hot-dip galvanized steel with bonded epdm rubber washer. 15mm (.590 Inch) OD x .245 inch ID metal washer with ~.180 Inch ID rubber washer. Fits #10 to #12 and 3/16 sized screws. Price/100.
Popular for use with #10 to #12 roofing or siding screws and 3/16 rivets/spikes.
SIZES
#10 ID x 3/8 to 1" OD
#12 ID (.230/.240) x 1-1/8" to 1-3/16" OD
#14 ID (.260/.275) x 1-1/8 to 1-1/2" OD
#17 ID (.305) x 1-1/8 to 1-1/2" OD
5/16" ID (.330/.360) x 1-1/8