CAPPAK5M CAP & STAPLE BULKPAK 5M BOSTITCH | 1 in plastic Bostitch caps & 5/16th crown, 18 ga 1 in staples eliminate pull-through when installing felt, house wrap and foam board insulation. For use with Bostitch cap stapler (273.5660) fits Bostitch tools SB150SLBC-1.