PE8027 Switchable Magnetic Welding Clamp Magnetic clamp with an ON-OFF switch for easy use. Safe and quick to set up; ideal for round and square tube angle and flat bar. Enclosed magnets to prevent filings and dirt from getting into the magnets. Heavy Duty Design 27Kg Force Super Strong Magnet (with on/off switch) Suitable for Straight 90deg 45deg & Curved Steel