The QB2 Kit is the Fastest and easiest way to mount Solar to a variety roofs Sealant is Optional. Leak Proof-Water Test Results - Sealant is Optional. ASTM E331 @ 15.00psf No Leakage. ASTM E331 (modified), 120 min @ 30.00 PSF No Leakage. ASTM E2140 (modified), 6" water column for 7 days No Leakage. Dual Drive System use either Standard 1/2" Hex or 6MM Hex Insert Bit. To compress MicroFlashing® properly with QB2 requires 150 Minimum Torque Lbs/Inch. The 10MM x 46MM rail slot accepts 5/16" or 3/8" bolts. Compatible with Rail and Most Railless Systems Including Snap N Rack, Unirac, IronRidge and Eco Fasten. Simply Drill, seal, and mount! Patent #8448407