1. Suitable for UMK422, UMK431, UMT431, UMK425 and UMK435 2. Takes all shapes of cutting lines from 2.0mm to 3.2mm in diameter 3. Universal 95% straight shaft grass trimmer fit. 4.Trimmer Head Adapter Size is 10mm x 1 .25mm left 5. Replace OEM number: 72560-VL1-631, 72560-VL2-63. Package included: 1 trimmer head Sold by PERMU store