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How many 4MM diamonds need to be attached to the iphone4s phone case, as follows.
Take a drill with a diameter of 3 mm as an example, and calculate the number of drills required for sticking drill articles.

Drill bit diameter: 3mm, attachment length (assuming):100mm, width: 60mm, height: 20mm.

Length 100 mm/3 mm =34 capsules.

Width 60mm ÷ 3mm =20 capsules.

Height 20mm ÷ 3mm =7 capsules.

Number of holes used for sticking project:

Dosage before and after: 34 capsules ×20 capsules =680 capsules.

34 capsules left and right ×7 capsules =238 capsules.

Up and down 20 ×7 capsules = 140 capsules.

Just do the math yourself. Don't buy less The average seller sells 200 yuan, which is quite a lot, but it takes at least 1000 yuan to attach a shell. Usually use a 3mm sticker. This kind of diamond doesn't need much.