RINGSPORT PRECISION ADJUSTABLE SPEEDBALL PLATFORMPrecision crank adjustment makes for perfect fit for all users!Extra heavy-duty steel frame is built for industrial gym use and professional workouts. High density 60cm x 2.6cm thick diameter walnut laminated wood platform is built for solid, lightning quick and true rebounds.Includes solid steel chrome guide shafts and precision 32cm worm drive height adjustment, which makes it perfect for all athletes from kids to adults. Complete with pro style swivel and all hardware to assemble.Design is ideal for low ceiling heights gym and home use.