Abstract: A cutter tool is provided with a handle member coupled to two portions arranged substantially orthogonally with respect to one another for supporting razor blades used to cut a rabbet along a corner edge of a ceiling panel. The two portions are arranged to form an inside corner guide which communicates with the corner edge of the ceiling panel during the manual cutting of the rabbet. The razor blades extend inward, orthogonally to one another, to cut the material of the ceiling panel during the manual operation of the cutter tool. A pair of cover plates is installed on the two portions for securing the razor blades thereto.

Abstract: A device for removing a weld bead from the external periphery of a plastic gas pipe.The device (FIG. 2) has a body 10 with an inclined reaction surface 13 and a blade 21. The blade 21 is engaged with a bead 22 and the portion 22a of the bead 22 which is lifted is gripped between a toothed wheel 17 and the inclined surface 21. As the wheel 17 is rotated by use of a lever 18 operating via a ratchet, the device is moved bodily around the circumference of a pipe 31 to remove the bead 22.Retractable and adjustable stabilising means 25, 28 etc. are provided and there is a hardened end portion 20 on the body 10 to enable the device to be hammered to engage the blade in the bead initially.