The base of the tool is manufactured from a soft flexible type rubber, this allows the tool to stick efficiently to many surfaces, leaving your hands free to control the drill. Easy To Use: Just to the wall and turn it on, it cleverly divert the vacuum flow and increases the velocity of the suction to the mouth of the tool. And providing extremely efficient removal of dust and debris. It can also safely contain water leaks. Hands-free dust extraction solution for drilling Fits almost any hose vacuums Works with corded and cordless vacuums Sticks to almost any wall surfaces Works with all drill types Minimizes dangerous airborne particles Maximizes suction around the drill bit Small Opening Adapter Diameter: 44/39/34/29mm Large Opening Adapter Diameter: 39/35/32/26mm Dimensions: Large opening type gray bowl: 202x102x55mm Adapter upper mouth: 40mm lower mouth: 25mm Small opening type ash bowl: 202x71x30mm Adapter upper mouth: 45mm lower mouth: 28mm Colour:black Material:Plastic + Rubber