Bolt size (3 options) - both M12 with 1mm pitch.

42mm length = for a sink thickness of up to 33mm. (supplied as standard for stainless steel and most granite sinks)

61mm length = for a sink thickness of up to 52mm. (for ceramics, belfast sinks etc.)

85mm length = for a sink thickness of up to 76mm. and a minimum of 39mm (for extra thick ceramics, belfast sinks etc.)

Designed to be used with the original Franke / LIRA Plug Strainer (underside stamped with 'LIRA ITALY No. 008445'.)