Purpose - to secure the connection to the wooden handle Material steel, step cut In a set of five sizes of two no. 1/28 x 32 mm/, 2/ 25 x 21/, 3/ 25 x 12 mm/, 4/ 18 x 10 mm/, 5/17 x 8 mm/ The different sizes allow you to optimally match the wedges to the tool you are using.