KEMPSTON 88123 Kempston Quick Change Extension, 3/16 x 18" KEMPSTON patent pending Quick Connect Extension can quickly and easily finish a drilling within a restricted area by using a regular drill bits. Easier to fit into most tool bags and storage boxes, Convenience: Create the right length for the job of 18" or together with 36" or more sections for different size combinations. More flexibility and versatility than traditional flexible drill bits Use with any type of bit with a 1/4" quick change hex such as spade bits or auger bits, drill bits for increased application flexibility