Ingco 8pcs combination spanner are double end tools that is an open ended form on one end and a closed-loop way on the opposite end. The two heads usually at a 15 degree an gle to the shaft to more reliable access the bolts and nuts. This single tool help the function of Two spanners directly. It is used for plumbing and other usual wear and damage around the home and it's spanners are available in sizes which range from 6mm-19mm which are (6mm, 8mm, 10mm, 13mm, 14mm, 15mm, 17mm and 19mm).