Meets USCG regulations for keeping batteries in place. Poly hold down strap with positive locking quick connect buckle make changing battery quick and easy. Mounts with #10 pan head screws. Fits Group 27 Size 12-15/16" L x 7-5/16" W x 1-1/2" H Fastener 4

Price is per unit.Also available in a case of 12. Please call us if interested in case pricing.