This listing is for a full set of 30 tines, fifteen  (15) each right and left hand tines for First Choice RT10-50" tiller, codes BRT-149 / BRT150  The BRT-149 and BRT-150 tines have a "C" shape and have two 1/2" mounting holes 1-5/8" apart on center. These are Heat Treated Boron Steel OEM quality tines that are made in Italy where these machines are manufactured.

Specifications
Heat Treated Boron Steel
Two 12.5mm (1/2"holes that are 42mm (1-5/8") on center
L: 185mm (7-5/16")
H: 115mm (4-1/2"11")
Use diagram in pictures to match up "L" and "H" dimensions
Plate: 70 mm X 6 mm / 2-3/4" X .236" before forging
Wt. 1.851 lbs