The Trend TR41 router bit is a high-quality, 10mm x 4mm intumescent cutter designed specifically for cutting fire doors. Made in the United Kingdom, this single router bit comes in a set of one, making it a convenient and efficient tool for DIY projects and workshop use. The Trend brand ensures reliability and precision in your cutting applications, providing peace of mind in the knowledge that your fire doors will be cut to the perfect size and with accurate results.