Features:A/B:1. The interior has a shock-absorbing rubber sealing sponge, suitable for charging small, miniature electronic devices.2. It can well protect the indoor equipment from being cut by rocks;3. Waterproof, shockproof and dustproof; C:1. Waterproof box that can be suitable in any environment in all weather conditions; Easy to carry to outdoor activities;2. Impact-resistant ABS engineering plastics and stainless steel and other accessories, buffer rubber mat, which can be easily installed and discharged; Solid and opaque structure effectively prevents light from penetrating;3. Specially designed to protect precision equipment, instruments or other items, effective waterproof, not affected by external dust or moisture, professional waterproof box; Specifications:Material: ABS Plastic Size: A (Small) B (Large) C (Professional)External Size: 170x110x4 8mm/6.69x4.33x1.89" 190x120x5 2mm/7.48x4.72x2.05"Internal Size: 150x80x4 0mm/5.91x3.15x1.57" 160x90x4 4mm/6.30x3.54x1.73" 170x70x7 5mm/6.69x2.76x2.95"Internal Depth: 18mm/0.71" 20mm/0.79"Net Weight: 150g, 190g, 343g1 x Portable Outdoor Work Tools Dry Box