Made in USA with 6061 T6 aluminum this single bolt prop adapter can eliminate the need for drilling your DA-50, DLE-50 or Dle-55 prop once installed. Using the equivalent of a US grade 8 bolt it comes complete with instructions, 4mm x 4 attach bolts and 10mm center bolt with 10mm phenolic shim. The center bolt is drilled for the use of a 10-32 spinner nut. This adapter will allow you to move your prop 7/8 of an inch forward if desired, or allow you to move your engine the same distance rearward to help with engine head and muffler clearance in cowl. Instructions are included, requires cutting of the original prop shaft and once the conversion is done will add 2.2 ounces of weight to your setup. The single bolt prop adapter, when not used with a spinner, will allow the use of an electric starter where the original 4 bolt configuration makes it difficult to use an electric starter.