Check the listing for details. MAINSPRINGS FOR ANTIQUE CLOCKS 31 DAY & 8 DAY. Condition: New. Listed at 9.99 USD. MAINSPRINGS FOR KEY WIND ANTIQUE CLOCKSKITCHEN, MANTEL, WALL These springs are for time or chimeWe always recommend changing both springs when a movement is disassembled 8 DAY is 3/4" x .0175" x 96" long loop end 8-day mainspring.31 DAY is 3/4" x .0150" x 170" long loop end 31-day mainspring. USE THE DROPDOWN MENU TO PICK THE ONE YOU NEED Please check out our other auctions. We may have items of interest to you. A note from seller. We strive for excellent customer satisfaction. Should buyer not be satisfied for any reason, please give us a chance to resolve the issue before contacting ebay, opening a claim, or leaving negative feedback. Also if you would please look at the pictures and ask any questions before bidding Thank you! Thank you for looking at our item!