The best Tungsten carbide, combined with accurate bore hole tolerance, to achieve best brazing connection and high durability.

1. Types: We can supply kinds of ROUND SHANK BITS and HOLDERS for different rotary piling rigs. Types as below: B47K-17H, B47K-19H, B47K-20H, B47K-22H.

2. Uses: These machine parts are widely used on foundation drilling, piling, Trenching, Tunneling, Road planing. They can suit for all kinds of drilling machines, Products can also be Custom-made.

3. Material: High Manganese Alloy steel Body, made of 42CrMo, heat treatment with 40-44HRC hardness, forged and Anti-rust treatment, has high toughness and wearable character.

4.Raw Material: Tungsten carbide is produced from wolfram carbide and cobalt. Wolfram carbide is one of the hardest known materials, but is also brittle. Combining it with weak cobalt a material is generated which is very hard and resistant to wear, and which can withstand extreme impact loads.

Founded in 2008, Beijing Guangying Construction Machinery Co., Ltd is a National Hi-Tech enterprise mainly engaged in manufacture, international and domestic trade. 
Guangying has managed OEM, sales of equipment, parts and electronic product, engineering design, technology consultant, general Export business and International Biddings or Engineering Projects. We uphold and respect the experiences and wisdom of manufacture and trading professionals. Complying with normative developing and manufacturing process, our products are in a leading position in China and we are developing ourselves to supply total solutions for our customers. 
For many years, by giving play to its own advantages, Dazheng yongye has successfully achieved the transformation of development patterns from domestic purposes to international fields. Dazheng yongye takes cutter pick, mining pick, drill rod, drill auger as primary business, becoming the most competitive corporation specialized in Machinery System. For many years, our company uphold the purpose: the customer is the supreme, the faith management, due to provide the full range of services of internal and foreign trade to our customers, we establish a good international and domestic business channels, and win a good reputation. While developing the domestic and export business, our company actively explore new areas of business, the scope has expanded to the international export tender, which help us to establish a good foundation for the lasting development of our company. 
Our company has always insisted on relying quality to seek survival, benefit to seek development. Use fine after-sale service to meet the needs of consumers. Honesty and credit. Products are sold well all over our country. Warmly welcome all fields of friends to visit our company and negotiate trade. 

We sincerely welcome new and old customers at home and abroad. Let us work together to develop the international market. 

Welcome to order, we will serve you.