Gripit TwistIT Self-Drive Plasterboard Fixings have an inner cam section that rotates once maximum torque has been reached. So unlike other self-drives, you can’t overtighten, no matter how hard you try. One Gripit TwistIT fixing holds up to 20kg. Easy to install, use a drill or screwdriver. There’s no need for pre-drilling or pilot holes and you won’t damage the walls. Ref: UTTK3261