In the same design as the 3-blade, the 4-blade Michigan Wheel DQ469 may be a more suitable choice for a particular application. Michigan DQ469 propellers are available in certifiable manganese Bronze or NiBrAl material. Standard SAE or metric bores are readily available for our Michigan propellers. DQ469 inboard propellers are hand crafted, carefully inspected, and balanced to close tolerance. The designs of Michigan Wheel propellers offer exceptional service life, and contribute to the enjoyment of trouble free boating.