Product Specifications/Features :. AT417 3/4 x 5/16 Tape: 3/4", mouth opening 5/16". AT417 7/8 x 5/16 Tape: 7/8", mouth opening 5/16". AT417 1 x 5/16 Tape: 1", mouth opening 5/16". AT417 1 1/8 x 5/16 Tape: 1 1/8", mouth opening 5/16". AT417 1 1/4 x 5/16 Tape: 1 1/4", mouth opening 5/16". AT417 3/4 x 3/8 Tape: 3/4", mouth opening 3/8". AT417 7/8 x 3/8 Tape: 7/8", mouth opening 3/8". AT417 1 x 3/8 Tape: 1", mouth opening 3/8". AT417 1 1/8 x 3/8 Tape: 1 1/8", mouth opening 3/8". AT417 1 1/4 x 3/8 Tape: 1 1/4", mouth opening 3/8". 53124SB throat plate. 53105SB feed dog. 53105SB-CT feed dog (carbide tipped). 53108SB looper