UltraEdge blades fit all Andis AG AGC AGR+ and MBG Models Oster A-5 and most Detachable-type clippers. Carburized steel extends edge life - adds carbon to cutting edge creating blades that stay sharper longer. Chrome finish resists rust and keeps blades at optium performance. Size 4 Skip Tooth leaves hair: 3/8 - 9.5mm. Fits Models: AG2 AGC2 and AGR.