Basketball Anchor Kit System: 9" X 9" Centers, Plus Rebar, Compatible with Goalrilla, Mammoth, Wilson, Pro-shot, Bison, First Team, Triple Threat, Etc. Fits all basketball goals with 9" X 9" mounting centers, including Goalrilla, Mammoth, Lifetime, Pro-Dunk Hoops, Wilson, Pro-Shot, Bison, First Team, Triple Threat, etc. If you measure the distance between the centers of any two holes (NOT diagonal holes) at the baseplate of the pole, the distance should be approximately 9" between holes Kit includes 4 galvanized 5/8" diameter 18" length anchor bolts and all galvanized fasteners (12 nuts, 8 flat washers, 4 lock washers, & 4 thread protectors). Kit includes 4 #3 rebar (40 inches in length). Kit contains detailed installation instructions.