These forgefix worktop clamps eliminate the need for surface mounted worktop joining strips the nut is tightened onto the bolt pressing the caps against the walls of the 35mm diameter holes the clamps are zinc plated for increased resistance to corrosion applicationworktop joints zinc coatings prevent oxidation of the protected metal to create a longer lasting finish it does this by forming a barrier and by acting as a sacrificial anode if this barrier is damaged zinc oxide is a fine white dust