drywall banjo taping tool, gypsum board joint tool, flat box finishing set with reversible inside corner roller wheel dual right left hand operation drywall tool b cdbz working principle:<br /> 1. release the seal inside the banjo<br /> 2. pour the compound into it<br /> 3. start filling the cast iron of the partition<br /> 5. use big wheels as angles and saw gears as corners<br /><br /> specification:<br /> material: high quality pvc and aluminum<br /> size: 24 × 9.4 × 8.7 inch<br /><br /> the package includes:<br /> gypsum board seam tool + spatula seam tool<br />