Alpha PVA VP Style 4-1/2&rdquo; Polishing Pad with 5/8&rdquo;-11 Hub - Fine 400 Grit One (1) 4-1/2" Fine pad - 400 grit Pad thickness: 3/8" Arbor: 5/8"-11 May be used wet or dry Recommended for Paint, Coating, Mill Scale & Rust Removal, Designed to Polish Stone, Ceramics, Metals & Woods