Main Block Size is 58 x 58 x 40 mm high with a 7/16 (11.1 mm) Stud Bore. Set comes complete with 3 standard holders + 1 Boring Vee Holder and 1 Hex Spanner + 1 allen key. Tool capacity upto 13mm approx. Our product is manufactured by us, we do not compromise on quality, the quality is the best you can ever get, kindly refer to the photos.