Great kit: includes 5pcs watch case back openers, 2 types and 8 Pcs Made of a plastic Great for professional watch repairers, watchmakers, and everyday users to open watch cases 4 Pair Strap Pins are approx. 1.5 mm in diameter and separately 18 mm, 20 mm, 22 mm, 24 mm in length, please make size before buying SPECIFICATION: The First Type Watch Case Back Opening Tool Knife: Length: 4.5 inch Stainless steel and plastic Precise sharp edge Handle comes in yellow Great for professional watch repairers, watchmakers, and everyday users to open watch cases The Second Type Watch Cover Opener Knife: Made of a durable stainless steel and plastic Watch back opener approximately 3.3 inch long 4 different sizes of open tool Popular in pocket design Simply place the blade under the case back and pry it off Color: yellow material: plastic Package Contents: 1 x The First Type Watch Case Back Opening Tool Knife 4 x The Second Type Watch Cover Opener Knife 8 x Strap Pins Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.