8 Pc Trade Builders Quality SDS Plus Masonry Brick Concrete Drill Bit Set 5 - 12 mm - NEW

What is an SDS (Special Direct System) drill bit?

Developed by Bosch in 1975 for hammer drills, the SDS System uses an SDS Shank which is a cylindrical shank with indentations to be held by the chuck. A tool is inserted into the chuck by pressing in, and is locked in place until a separate lock release is used.

The rotary force is supplied through wedges that fit into two or three open grooves.

The hammer action actually moves the bit up and down within the chuck since the bit is free to move a short distance. Two sprung balls fit into closed grooves, allowing movement whilst retaining the bit. SDS relies on a tool having the same shank diameter as the chuck.

There are three standard sizes:

SDS-Plus:A 10 mm shank with two open grooves held by the driving wedges and two closed grooves held by locking balls. This is the most common size and takes a hammer up to 4 kg. The wedges grip an area of 75 mm2 (0.116 sq in) and the shank is inserted 40 mm into the chuck.

SDS-Top:A 14 mm shank similar to SDS-plus, designed for hammers from 2 to 5 kg. The grip area is increased to 212 mm2 (0.329 sq in) and the shank is inserted 70 mm. This size is uncommon.

SDS-Max:An 18 mm shank with three open grooves and locking segments rather than balls. It is designed for hammers over 5 kg. The wedges grip an area of 389 mm2 (0.603 sq in) and the shank is inserted 90 mm.

Many SDS drills have a "rotation off" setting, which allows the drill to be used for chiseling. The name SDS comes from the German steck, dreh, sitzt (insert, twist, fits). German-speaking countries may use Spannen durch System (Clamping System), though Bosch uses Special Direct System for international purposes.

8pc SDS Drill Bit Set Complete with Handy Storage Case Suitable for a wide range of Masonry and concrete drilling Sizes from 5mm to 12mm drilling length from 50mm to 150mm.

Manufactured from high quality steel with hardened and tempered head for an extra strong cutting blade.

Shanks of the drill bits are SDS type for use on SDS rotary hammer drills.

For use on concrete, masonry, lightweight block and stone.

Specification

• Type : SDS Plus Masonry Brick Concrete Drill Bit Set
• Bit size1 : Bit lenght : Twist lenght: 1 : 5mm x 110mm x 50mm
• Bit size2 : Bit lenght : Twist lenght: 2 : 6mm x 110mm x 50mm
• Bit size3 : Bit lenght : Twist lenght: 3 : 8mm x 110mm x 50mm
• Bit size4 : Bit lenght : Twist lenght: 4 : 6mm x 160mm x 100mm
• Bit size5 : Bit lenght : Twist lenght: 5 : 8mm x 160mm x 100mm
• Bit size6 : Bit lenght : Twist lenght: 6 : 10mm x 160mm x 100mm
• Bit size7 : Bit lenght : Twist lenght: 7 : 12mm x 160mm x 100mm
• Bit size8 : Bit lenght : Twist lenght: 8 : 8mm x 210mm x 120mm
• Fitting : SDS fitting
• Material : Hardened and tempered steel
• Flange Material : Tungsten Carbide flanges
• Grade : Trade quality
• Storage : Bespoke molded case

RRP - £19.99