This is a neat low mass record clamp. It's made from aluminium and weighs just 80gm putting it amongst some of the lighter clamps available (please note that whilst this is a low mass design it may still not be suitable for some suspended turntables).
The knurled securing nut clamps it to the turntables spindle. Unlike some other clamps it can accommodate tall spindles - they can protrude above the LP by approximately 20mm.
