Item Type: Button battery holder_x000D_ Port: With a 2.54mm contact pin port, easy to insert into the breadboard (4 pin contact pins should be soldered by the buyer)_x000D_ Size (length x width): Approx. 33.02 x 27.94mm / 1.30 inch x 1.10 inch_x000D_ Hole Distance: Approx. 26.67 x 21.59mm / 1.05 inch x 0.85 inch_x000D_ Aperture: Approx. 3 mm / 0.12 inch 1Come with 2.54mm contact pin port, button battery holder can be easily insert into breadboard 2High?performance and quality blade?pin can improve product quality and longer service life 3Suitable for CR2032 button battery of diameter 20mm, easy to disassemble 4Adopts exquisite craftsmanship, coin cell holder's quality is guaranteed, you can use the product with confidence 5Entitled with high practical adoptability, button battery holder's high quality can keep its high performance for a long time3 x Button Battery Holder3 x Pin HeaderBattery is not included.