Allows for increases by 5lb increments (and 2.5lbs for machines that include functional cable arms). Inter-Locks with Top Plate so that it cannot slip or fall off. Machined from solid steel (steel cannot be damaged like rubber style add-ons). Coated with a durable baked on powder coat finish. Built for both commercial and home use. Custom designed to specifically fit Bodycraft products* (some aftermarket 5lbs add-ons are not compatible with certain Bodycraft products). *Compatible with: Galena Pro, XPress, X2, X4, GL, GLX, GXP, Elite, Jones Lat and F431 Lat. *Compatible with discontinued: Strata, M300, MPress, Family XPress, GX, K1, & K2 gyms. ***NOT compatible with CFT, HFT, PFT, RFT, and Jones Functional Cable Crossover.***