THIS ROTARY TECH USA SHELL MILL FEATURES A 4-INCH CARBIDE INSERT HEAD ATTACHED TO A 1-INCH SHANK. THE TOOL HAS AN OVERALL LENGTH (OAL) OF 4 INCHES, WITH A SHANK LENGTH OF 2.5 INCHES AND A SHANK DIAMETER OF 1 INCH. THE HEAD DIAMETER IS 4 INCHES, AND THE HEAD THICKNESS MEASURES 1.5 INCHES.