For conventional construction, clean the joints of the plasterboard, fill the joints with caulk, then pour white latex, and stick the tape in the middle of the joints with a tool. Tape applicators and tape cutters can also be used on inside corners, edges and on all types of partitions and walls. Time saving and efficient, the two adjustable handle straps , one on each side, are practical for both left and right hands. Quick change inside corner application wheels can be easily reversed with the flat application wheels. Drum type design, easy to operate, saving time and improving work efficiency. Durable and durable high-quality polycarbonate body eliminates bumps, foreign objects and parts bent, giving the drywall application tool longer life and durability. Working principle, 1. Loosen the sealing strip at #39;interior of the banjo; 2. Pour the compound into it; 3. Start filling the partition; 4. Cut the joint with a flat knife; 5. Make a corner with a large gear and a corner with a serrated gear. Scope of application, the drywall tool is suitable for plasterboard assembly of 1.2 x 2.4 m, preventing the wall from cracking at the junction of two plasterboards. It can also be used for small jobs, decorations, additions, renovations or small spaces such as closets, corners, walls and ceilings. Small gluing wheel for walls Large gluing wheel for corners and side joints Large gluing wheel Suitable for corners and side seams. 4-position switch Switch controls putty thickness