This set of spark plugs from DENSO is a high-quality replacement for your lawn and garden equipment. With a 14mm thread diameter and 16mm hex size, they are designed to fit standard configurations. Made of nickel and compatible with gasoline fuel type, these spark plugs provide dependable performance. The T20M-U model is a versatile type of spark plug, with interchange part numbers including BMR6F, UR17, BM6F, CS45T, TC8, U17, BM6FY. They are made in Japan and are for 12V voltage systems or magneto. These spark plugs are perfect for those looking for a reliable and durable replacement part. Exact item lot is shown. Thread diameter: 14mm. Thread reach: 7.8mm. Seat type: tapered. Hex size: 16mm. Made in Japan. No returns on installed items or partial lots. Please review our business policies in our store for information regarding returns, shipping and warranties. Most items have 30-day returns along with free fast shipping in 1 business day (see details). Message us anytime. Buy from a trusted 16+ year seller!