Wide Applicable - Rotary Nut and Knob Replacement Fits Hayward Superpump Models sp1600x5,sp1605x7,sp1607x10,sp1608x10,sp1610x15,sp1611x15,sp1615x20,sp1616x20,sp1621x25 Also Fits Maxflo Pump Models sp2810x15. Note - The size of the rotating nut and knob replacement is reasonable, and the length of the nut is approx. 6.3 cm / 2.48 inches, screw length approx. 4 cm / 1.57 inches, screw diameter approx. 0.8 cm / 0.3 inches, suitable for you, manual measurement, please allow slight error. There is only one set of nuts and knobs in the package, other accessories and tools need to be prepared by yourself. Material - Rotating nut washer, nut, knob, screw head and nut are made of black high-quality plastic, durable, the screw is cast metal, and the tightening is stronger. Usage - You can apply these toilet seat bolts and nuts in various places, can be applied in swimming pools, tub pools, spa areas, etc., and can support you for a long time.