[Conventional construction]: Clean drywall joints, fill joints with caulk, then pour white latex and use tools to stick joint tape in center of joint . Corners, edges and types of partitions and walls.[Save time and efficiency]: By quickly replacing the inside corner applicator wheel, the flat applicator wheel can be easily flipped. The spool design is easy to operate, which not only saves time, but also improves work efficiency.[Adjustable strap with two handles]: Use one hand on each side . With practical ergonomic principles, you can manipulate it in any direction. Avoid bending your back The tape applicator and braided knife not only ensure even results, but also have padded handles for precision and comfort.[Durable]: The polycarbonate body durable eliminates shocks, foreign objects and bent parts, thus extending the service life.[Working principle]: Clearing the sealing strip in the banjo. Pour the compound; Start filling in the partitions. Cut the seams with a flat knife. Use the large gear as the key and the saw gear as the key.