Product Name: resin drill

Specification: 4mm

Quantity: ten thousand price

Net weight: 115 grams.

• Generally stuck drill 3 mm is the most commonly used. Calculation method for long divided by the size of the drill， wide divided by the size of the drill， and the number of people can get rough side. Is actually calculate area， patience to work it out just know how to buy diamond drill. The iPhone 4， for example， on the back of the size of 11.8 * 6 cm， use 3 mm drill is 11.8/0.3 = 40， 6/0.3 = about 20， 40 * 20 = 800， 800 is the number we want to stick on the back (usually buy more oh). If the phone needs to stick， and other surface according to the above method can