Long Arm Wingnut Internal Thread DIA - 20MM Width - 240MM Metal - 316 Grade Stainless Steel Code A(MM) B(MM) C(MM) D(MM) E(MM) SFSSTN10 39 240 30 10 75 SFSSTN12 39 240 30 12 75 SFSSTN16 39 240 30 16 70 SFSSTN20 39 240 29 20 70 SFSSTN24 39 240 30 24 75 Wing Nuts Are Used When Something Needs Turning Frequently So These Can Be Turned Without Tools Or If Something May Need Turning Quickly. These Are Hugely Popular Within The Marine Industry As They Are Manufactured From 316 Grade Stainless Steel Giving Them The Best Rust Protection. Please Note We Supply A Huge Variety Of Stainless Steel Parts. FREE DELIVERY Product Code - SFSSTN20