Offers mobility to heavy loads on smooth, hard surfaces and finished concrete floors where quiet movement and floor protection are major considerations. Use on carpet, ceramic, concrete or wood. 765.0518 has 1-1/2 x 1-3/4 in plate size. 542.0864 has 1-7/8 x 2-9/16 in plate size. 623.0015 has 2-3/4 x 3-7/8 in plate size. 787.3813 has 3-1/8 x 4-1/8 in plate size. 998.2935 has 4 x 5-1/8 in plate size. 588.9928 has 2-7/8 x 3-5/8 in plate size