McMaster 5862K939 Nickel Plated Neodymium Magnet, N45, 1 4" Thick × 1 2" Wide × 2" Long, 28 lb Pull, 2 Countersunk Holes 4TKV7 ASTM F2503 Tether Capable Tether ASTM F2503 Tether Capable Tether Capable Screwdriver and Nut Driver Grouping Screwdrivers Insulated No Tip Style Slotted ESD Safe No Handle Color Yellow Tether Style Tether Capable Shank Coating None Tip Finish None Corrosion Resistant Yes Magnetized Tip No Tether Ready No Slotted Screwdriver Tip Shape Keystone Shank Finish Natural Non Magnetic Yes Measurement Type SAE Non Sparking Yes Grip Style Plain Replaceable Shank No Package Quantity 1 The open base allows you to drill through your workpiece without hitting the bottom of the vise these magnets deliver a concentrated magnetic force 500 G Maximum Energy Product 342 kJ m³ Magnetic Pull Rating Medium Direction of Magnetization Through Thickness Sets of Poles 1 Mount Type Unthreaded Hole No