For Repair or Maintenance of the 40TT 2-in Corner Finisher. Includes: Blade Tension Spring - 400005, Center Clip - 402017F, Center Clip Assembly - 404014F, (2) 8-32 x 1/4-in Set Screw, 1/2 Dog SST - 059084, 6-32 x 1/2-in Fillister Head Screw SST - 059091.