Features 1 or 4-inch shank, 1-inch cutter depth, 1 or 4"1 or 2"3 or 8"5 or 16" diameter cutting diameter recessed trim router bit set 1 or 4-inch shank bearing recessed trim router bit made of C3 micron carbide inserts with heat-resistant Teflon coating for long service life Dual straight edges for clean, burr-free surfaces, sharp cuts, smooth rotation, and quick operation Suitable for use on a wide range of materials and surfaces such as wood, MDF, chipboard, plywood, lumber, softwoods, hardwoods, etc. Product Information Product Name: Trimming knife set of four Product Material: Carbide Product Size: Refer to the picture Product color: as shown in the picture Packing list: trimming knife set x 1 set (a set of 4 sizes) Please note: 1. Due to the long shipping time, the goods may be damaged during transportation, if the goods are damaged, please leave us a message through the official website immediately before posting a comment, I will solve the problem for you. 2. Due to manual measurement, the size may have 1-3cm error. 3. 3. The color displayed by different monitors may vary.