Llyn Idwal stone 150x25x5.5mm on blank

Llyn Idwal - Welsh slate (England). Close relative of Charnley Forest. Named Llyn Idwal after the lake where it is mined. The stone is dense, finishing. Abrasive capacity is usually estimated as 4000-6000 Japanese grits. Depending on the use of coolant, finishing stone and pressure on the RC. The stone works with oil, water and suspension. Due to its high hardness, it is suitable for working both along the entire lead and for micro-lead.