This listing is for a full set of 42 tines, twenty one (21) each right and left hand tines for First Choice RT10-58" 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. We sell many replacement parts for the various brands of rotocultivators. If you don't see the parts you need listed please contact us we would love to earn your business. We are listing new items frequently so please check our store often. 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 Part Number: Twenty one each BRT-149 & BRT-150 We stock a wide variety of replacement parts for Agricultural Equipment please contact us you have any questions or if you would like more information.