Franklin Sports Shot Zone Replacement Blade (Junior) The Franklin Shot Zone replacement blades are molded from high impact polymer, for long lasting durability and abrasion resistance Available in two sizes (JR and SR) and in both left and right shots, these replacement blades are intended for use with Franklin 1010 and 1020 shafts Each blade is molded to fit a 20mm x 30mm shaft and includes 2 self tapping screws