1 4 in. and 3 8 in. Drive Bolt Biter Impact Extraction Socket Set (8 Piece) Item Weight:4.65 SBS modified asphalt mineral surfaced SBS modified asphalt mineral surfaced roll roofing membrane For residential and commercial low slope application Synthetic rubber gives asphalt enhanced performance characteristic and greater flexibility Exhibits high multi directional strength and excellent cold temperature flexibility in addition to elongation Supercap SBS can be applied with hot mopping asphalt or cold process adhesive Upgrade system from traditional built up roofing and non modified MSR rolls Excellent pliability and flexibility compared to traditional mineral surfaced roll roofing and bur cap sheets Excellent granule adhesion Rolls out flat for easy installation The Variable Speed Self Propelled Mower offers speeds between 0 4 MPH we built Bolt Biter to match the strength of our traditional impact sockets This improved design also seats easily onto the fastener