Bosch GFA 12-H Professional FlexiClick SDS Attachment. Turns the FlexiClick drill driver into a SDS plus rotary hammer. Easy to operate. A 'One-Click' interface ensures a tight fix to the machine at a glance. Suitable for hammer drilling up to 10mm into concrete and up to 16mm into masonry and stone. It is compatible with the 12V FlexiClick drill drivers GSR 12V-35 FC and GSR 12V-15 FC. For best working progress, use GSR 12V-35 FC.