Qualfast: M16-SW24 Security Shear Nut A2 A2 Stainless Steel A high security permanent nut fastening. The hexagonal part of the nut shears off at a predetermined torque (as only the cone is threaded) leaving a tamper resistant cone fastening behind. MPN: M16-SW24 Security Shear Nut A2 Attributes: Box Quantity: 25 Driving Features: Hexagon Socket Head Shape: Hexagon Length: 22mm Material: A2 Stainless Surface Treatment: Plain Thread Size: M16