2 pcs Rubber O' Ring for holding thread tube in place. Fits Babylock and Brother Embroidery Machines Fits Babylock Embroidery Machines: BMY6 Array, EMP6, BMP8 Fits Brother Embroidery Machines: BAS-423, FB-V41A, PR600, PR600C, PR620, PR650, PR680W Manufacturer Part Number: #081005070 or XE8376001 Dimensions: OD 5/16'' X ID 3/16'' X Wd 1/16''