Progressive Roller bit core barrel-S Line is used in compact strong rock formations (compressive strength > 100 MPa).
Cutting ring with quick change roller bits. Spiral round the cylinder, reamers and depth limiters to optimize drilling performance.

200 kelly box made of heat-treated cast steel with two locking pins. Wear strips or Tungstuds wear protection on the barrel body. Fitted with quick change roller bits. Bottom rings in Hardox HB 500.