SX0683 : St Teath: The Bettle & Chisel SX0683 : The Bettle and Chisel, Delabole SX0683 : The Bettle and Chisel, DelaboleBettle (wooden mallet) and Chisel (sharp edged steel shaft) are tools used to split slates, a natural product from the quarries around Delobole that was once the prime roofing material for houses in the UK. It has mostly been replaced by man-made tiles at the present time, but the Delabole quarries are still worked at a reduced scale for select usage.