Hydrofarm heat mats are perfect for veteran growers, beginners, and children too. They improve germination by warming the root area 10-20°F over ambient temperature. By warming the roots, you increase your growing success! Bottom heat is one of the most important and effective ways to improve germin...

Hub assembly has 5-bolt pattern on 4½" circle. Includes L-68149 inner bearing, L-44649 outer bearing, SL-172 grease seal, SCP-100 cotter pin, DC-1505 dust cap, (5) STN-506 lug nuts and pressed in bearing races. Pilot diameter 2.59 inches, flange diameter 6.5 inches.