Flexible shaft coupler, 1/4" (6.35mm) equal end Internal Diameter (ID). Outer Diameter:                19 mm Length:                              25 mm ID1: 6.35mm ID2: 6.35mm UK Seller, Quick dispatch Returns accepted. Combined postage with an addition of 35p per item, £2 for overseas purchases. First Class signed For, Special Delivery and Tracked options are available at the checkout. Next Day Special Delivery option available on checkout for UK purchases.