10" STEEL WIND TURBINE HUB WITH AIR-X BOLT PATTERN FOR 11 AIR-X TYPE BLADES. THESE HUBS ARE MADE OF 1/8" COLD ROLLED STEEL BECAUSE THAT'S HOW THICK, ANY THICKER IS A PURE WASTE OF YOUR HARD EARNED CASH AND RAISES THE START-UP WIND SPEED!!! THEY ARE PUNCHED ON A CNC PUNCH PRESS IN AN AEROSPACE QUALITY MACHINE SHOP NOT SOMEONES GARAGE. THEY ARE UNPAINTED AND WITH A GOOD COAT OF WHATEVER COLOR RUSTOLEUM YOU PREFER SHOULD LAST A DOZEN YEARS OR MORE. EACH HUB HAS 11 SETS OF 1/4" CLEARANCE HOLES SPACED 15/16" APART FOR 11 AIR-X AND MANY OF THE OTHER BLADES BEING SOLD HERE . SIMPLY SELECT THE SIZE CENTER HOLE OF YOUR CHOICE OF 17MM, 1/2", 5 /8" OR A CUSTOM SIZE CENTER HOLE. WE HAVE MANY MORE SIZES AND BLADE CONFIGURATIONS IN OUR STORE AS WELL AS LOTS OF OTHER WIND TURBINE PARTS AND ACCESSORIES. WE HAVE SOLD SEVERAL HUNDRED HUBS AND HAVE NO COMPLAINTS OR PROBLEMS WHAT SO EVER. ( PLEASE READ OUR FEEDBACK! THEN READ THE THE FEEDBACK ON THE GUY MAKING ALL THE ACCUSATIONS ). ALSO WE STAND BEHIND ANY WIND PRODUCT WE SELL, IF YOU ARE UNHAPPY FOR ANY REASON SIMPLY RETURN THE ITEM FOR AN EXCHANGE OR A FULL REFUND INCLUDING YOU ORIGINAL SHIPPING COST. THE OTHER GUYS WON'T DO THAT! WE TRY TO ANSWER ALL QUESTIONS DAILY SO FEEL FREE TO CONTACT US. GOOD LUCK AND HAPPYING!! PLEASE GET AS MUCH UNBIASED INFORMATION AS YOU CAN FIND DON'T FALL FOR ALL THE FEAR MONGERS CRAP AND MAKE YOUR OWN INFORMED DECISION. THANKS FOR LOOKING AND GOD BLESS.