Tool for fast drumhead replacement. Clear Reinforced Polycarbonate Disc for visibility and strength, 10 Chrome plated keys designed for Tru Tuner, Zipping mesh bag with clip for easy storage of keys, Works with sizes 8'', 10'', 12'', 13'', 14'', 15'' and 16''on most standard lug patterns 4, 5, 6, 8, 10 and 12 (12 lug 13'' and 14''), Folding handle for safe and easy storage, Fits in cymbal case for easy transport, Numbered start holes for lining up specific drum size, Lined ridges on disc to follow in order line up keys easily for each specific drum size, Disc bottom is flat for strength when on flat surface and to prevent damage to drum heads, Color coded rings for easy setup on each drum, Lifetime Warranty