This kit contains all the necessary tools to open watches with screw back with as background clipped, adjust the metal bracelet by removing links with different fastening systems, change the batteries, and still other times delicate operations. it contains a box with pumps (connecting flexible straps) of different sizes, a box with rings of various sizes and small pieces of mechanical movements, it also contains tools such as small screwdrivers of different sizes, and all that in an aluminum case with good closure. when we see that to change a battery when the bottom is screwed and have to change the gasket for watertight basic watchmaker will charge you a minimum of 20 euros and to settle a metal bracelet it will charge you minimum of 12 euros if you are a collector like me and have several watches, accompanying this briefcase with 2 or 3 piles of chips and a box of seals you will ready to service your watch and the ones you buy; and all this at very reasonable prices.