Specifications:
T-head bolts with double nib, known as Hammerschrauben mit Nase, are specified under DIN 188. These bolts are available in various sizes and are suitable for use with "Halfen" profiles.

Ordering Example:
An example for ordering is provided as: DIN 188 - A 4 - M 12 x 50.

Dimensions and Pricing:
The document lists dimensions and corresponding prices for 100 pieces. Key dimensions include:

• b: 22, 26, 30, 38, 46
• k: 5.5, 7, 8, 10.5, 13
• n: 8, 10, 12, 16, 20
• m: 18, 21, 26, 30, 36
• d: M 8, M 10, M 12, M 16, M 20

Prices vary based on the length (l) in mm, with examples such as:

• 30 mm: 332.00
• 50 mm: 396.00 to 930.00 depending on the diameter
• 100 mm: 914.00 to 2096.00

Additional Information:
The bolts are also deliverable for "Halfen" profiles, indicating compatibility with specific construction systems.