Feature:1. Come with 2.54mm contact pin port, button battery holder can be easily insert into breadboard2. High‑performance and quality blade‑pin can improve product quality and longer service life3. Suitable for CR2032 button battery of diameter 20mm, easy to disassemble4. Adopts exquisite craftsmanship, coin cell holder's quality is guaranteed, you can use the product with confidence5. Entitled with high practical adoptability, button battery holder's high quality can keep its high performance for a long timeSpecification:Item Type: Button battery holderPort: With a 2.54mm contact pin port, easy to insert into the breadboard (4 pin contact pins should be soldered by the buyer)Size (length x width): Approx. 33.02 x 27.94mm / 1.30 inch x 1.10 inchHole Distance: Approx. 26.67 x 21.59mm / 1.05 inch x 0.85 inchAperture: Approx. 3 mm / 0.12 inch.Package List:3 x Button Battery Holder3 x Pin HeaderNote:Battery is not included.