Sub-floor fastening system for fast work, sturdy joins and peace and quiet, for use with our dedicated pneumatic coil nailer to get maximum performance, superior productivity on the jobsite and raise homeowner satisfaction. The tetraGRIP? sub-floor fastening system is a technological breakthrough in sub-floor fastening for the residential builder. With its dedicated pneumatic coil nailer, the tetraGRIP? sub-floor fastening system drives as fast as a nail and has the holding power of a screw. Fast work, sturdy joints and peace and quiet.