If you are looking for a set of screw extractors that both high quality and durable, this one is it.

Features:
Screw extractor set for easily and quickly removing broken screws, bolts and studs, etc.
The screw extractors in different sizes to meet varied needs.
Made of high quality chrome-vanadium steel, durable to use.
Come with a plastic case to carry screw extractors.
Straight round shank.

Specifications:
Material: 35 Chrome-vanadium Steel
Quantity: 5pcs
Extractor Type: #1(4mm), #2(4.5mm), #3(6.4mm), #4(7.6mm), #5(11mm)
Extraction Range:  #1(3-6mm), #2(6-8mm), #3(8-11mm), #4(11-14mm), #5(14-18mm)
Item Length: 4.7-8.2cm
Package Size: 8.5 * 5.5 * 1.5cm / 3.35 * 2.17 * 0.59in
Package Weight: 120g / 4.23oz

Package List:
5 * Screw Extractors
1 * Plastic Case