Heavy Duty 3 to 1 Ball and Pin Protectors developed to provide ball and pin protection! 20% LARGER than all other designs/built to last for the long term with the solid 3/8" steel with 3/8" poly face plate to protect the pins.top contoured design protects the balls from damage that is created from contacting the ball wheel elevator edge.with the non scuffing rubber protector sleeve provides a safe landing pad for balls that become derailed during ball return delivery to return track assy.I SLEEP BETTER knowing the customers bowling balls are protected from the damage that will occur without the protection from the 3-1 ball/pin protectors! get them in your pinsetters at a 2or 4 part monthly order and give your center the protection the customers deserve.no more bolt mounting issues! torque the bolts tight and check them monthly,contact ace Mitchell for distribution!