Button Head Coupler, Female Female, 1 8 in, Giant pull on type ORS NASCO Back of saw blade can Back of saw blade can be used to mark 45° and 90° angles 3 sided tooth design cuts wood 50% faster than conventional saws Fits in most tool boxes has a nice thick edge for easier more accurate marking and helps keep your soapstone from slipping 36" tape measure printed on the medium & large Wizard limits the need for an extra tape measure Circumference & Quartering scale printed on every wrap limits the need for calculation Packaged in a durable For use with hand operated grease guns only For use with button head fittings High quality to ensure durable reliable performance