which increases the contact surface in the screw head to reduce rounding and thus minimize the risk of damage to the fastener

The product is listed on Intercable Tools' product list and comes with a red insulation sleeve

7 mm recovers to internal diameter 6

6 mm and a length of 13 mm

Bøsning SLB4-F forgyldt blå CAT III 1000V 24A m/fladstik 4,8x0,8 Unit(s):Pcs which increases the contact surface. Insulated, rigid, 4 mm, accepting spring loaded 4 mm plugs with rigid insulating sleeve. Machined brass. Insulation material UL94 V 0. The socket is screwed into pre drilled panels of plastic, metal, etc. Flat connecting tab 4. 8 mm 0. 8 mm.