These high density Covert Tungsten Link-Sinkers have been developed to ‘pin down’ hooklinks. The sinkers grip the line or leader. They are an ideal base to mould Tungsten Putty onto.Covert Tungsten Sinkers are 7.5mm x 2mm. Tungsten Sinkers are available in 2 different bores: Low Bore – for use on monofilament. High Bore – for use with skinned hooklinks, leadcore and leadfree.