JB Distributors' Long Magnetic Nut Setters come in units of 20. We have both the 5/16x2 9/16 or 1/4x2 9/16 options available. The 1/4 inch is for #8 hex washer head, sheet metal or tek screws. The 5/16 inch is for #10 hex washer head, sheet metal or tek screws. JB Distributors is currently offering a super special closeout on all Long Magnetic Nut Setters. Long Magnetic Nut Setters are great for electricians, plumbers, sheet metal, fire extinguisher sales and service and mechanical contractors.