Check the listing for details. A.B. Biller 5/16" Freeshaft. Condition: New. Listed at 69.95 USD. Our eBay Store About Us Contact Us Add to Favorite Sellers Please contact us for a personalized shipping quote A.B. Biller 5/16" Freeshaft Spring stainless steel Heat treated to Rockwell 44C Unique combination of hardnes and spring tension All A.B. Biller shafts are stainless spring steel manufactured from a special alloy originally developed for the U.S. Navy. Heat treated to Rockwell 44C, these shafts produce a unique combination of hardness and spring tension. Line shafts 42" and longer come with 3 grooves to accommodate 3 bands if desired. Choose from a 5/16 diameter or 9/32 diameter. These shafts also fit the Seahornet spearguns. Size chart: Shaft Size Speargun Size 48" 36 or 42 Special 54" 42 or 48 Special 60" 48 or 54 Special 66" 54 or 60 Special 72" 60 Special Product Details Category Spearfishing > Shafts SKU SF72 Weight 7.0000 Color Size 72” UPC .