FlexiClick Attachment GFA 12-H. The GFA 12-H Professional is the world's first 12V hammer attachment. It offers optimal flexibility by transforming the FlexiClick drill driver into a fully functional SDS plus rotary hammer. This makes it the only 12V drill driver suitable for effortless hammer drilling in concrete with an impact energy of 0.9 J. The GFA 12-H is part of the 12V FlexiClick System and offers numerous easily interchangeable attachments. It is suitable for a variety of applications, making life easier for the craftsman. The Bosch Professional FlexiClick System is perfectly equipped for professional work. The GFA 12-H is suitable for hammer drilling up to 10 mm in concrete and up to 16 mm in masonry and stone. It is compatible with the 12V FlexiClick drill drivers GSR 12V-35 FC and GSR 12V-15 FC. For the best work progress, use the GSR 12V-35 FC. Additional handle, depth stop, cardboard box.