Explanation: Accessories: valve grinding tool can be used to clean carbon deposits on the valves of cars, motorcycles, All-terrain vehicle and small engines 4 suction cups: The drill valve grinding kit includes 4 connectable suction cups in sizes of 20mm (3/4 inch), 30mm (1-3/16 inch), 35mm (1-3/8 inch), and 45mm (1-3/4 inch), which are oil and UV resistant and can be installed and fixed in various valve sizes in lawn mowers, cars, or motorcycles Convenient to use: The valve grinding accessory tool can be used in conjunction with a small electric drill. Different engine valve sizes can be used in conjunction with different suction cups, with operating speeds ranging from 1000rpm to 1250rpm, making it convenient and fast to use. Durable: The valve grinding tool is made of high-quality rubber, which is not prone to aging and corrosion, has a long service life, and can be reused. High work efficiency: The drilling rig accessories provide greater control and productivity, with good performance. Specifications: Color: As shown in the picture. Material: rubber+metal. Sucker: 16/20/30/35/45mm. Speed: 1000rpm t Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.