Newborn Deluxe X-Tender Hex Rod Caulk Gun with Reversible 2-in-1 Joist Guide, 45" Length, 1/4 Gallon Cartridge, 10:1 Thrust Ratio 10:1 Thrust ratio Deluxe 45-inches caulker for sub-floors, ceilings and roofs Reversible 2-in-1 Joist Guides Use with 1/4-gallons cartridge