DOP65-224 MTD Blade Adapter fits push mower series 010, 020, 030, 040, 050, 060, 070 & 080, and self propelled series 090, 100, 200, 300, 400, 500, 700 & 800, fits years 1986-1996, made of powdered metal. Size: 3/8" Side Holes, 3/16" Key - built-in. Replaces # 748-0323 (adapter), 948-0323 & 753-0484 (kit).