Classic Composition Mount QMSC Lag Bolt Specifications Specific Gravity 5/16 shaft per 3 thread depth 5/16 shaft per 1 thread depth meeting ASTM D 4586 Type II between the flashing and the shingle n Take care not to damage the roofing material while working on the roof Removing stone granules and deforming the shingles in any way can shorten the lifespan of the