This set is multi-functional for use. It's suitable for electrical/industrial maintenance， lab， factory and other use.

Features:
Precise tools with different sizes， fitting for different use.
Made of chrome-vanadium steel， surface with chromate treatment， durable for use.
Includes 21pcs screwdriver bits(Torx， Hex， etc.) and 7pcs sockets.
The reversible ratchet handle matches the flexible extension tube， which can work well in particular cases.
A storage box can make it easy to carry and prevent screwdriver bits from losing.
Ratchet handle can save labor for user， more convenient.
Wide range of application， suitable for electrical/industrial maintenance， lab， factory and other use.

Specifications:
Material: Chrome-vanadium Steel 
Screwdriver Bits(25mm): 
4mm， 5mm， 6mm， #1， #2， #3， T10， T20， T30， T40， PZ1， PZ2， PZ3， 1.5， 2， 2.5， 3， 4， 5， 5.5， 6mm
Sockets: 4.5， 5， 6， 7， 8， 9， 10mm
Extension Bar Length: 100mm / 3.94"
Sleeve Extension Rod: 25mm / 0.98"
Ratchet Handle Length: 155mm / 6.1"
Retractable Tube Length: 145mm / 5.7"
Storage Box Size: 220 * 70 * 45mm / 8.66 * 2.75 * 1.77in (L * W * H)   
Product Weight(All Accessories): 555g / 19.6oz

Package List:
21 * Screwdriver Bits
7 * Sockets
1 * Extension Bar
1 * Sleeve Extension Rod
1 * Retractable Tube 
1 * Reversible Ratchet Handle
1 * Storage Box