Ordered these new and never needed to use them on my floor. The 3MT TrizactT Diamond TZ Pads are used to prepare stone surfaces prior to finishing and/or burnishing. Suitable for stone floors such as marble, terrazzo, limestone, travertine and concrete. Designed for use with autoscrubbers and low speed floor machines, including square vibratory machines. 3MT TrizactT Diamond TZ Pads should be applied to a 3M floor pad, such as the 3MT Red Buffer Pad 5100. Use three of the 3MT TrizactT Diamond TZ Pads arranged in the at the 12 o’clock, 4 o’clock and 8 o’clock positions on the floor pad.