No nails required, chrome-plated, removal of sash not required for installation. Includes 2 springs.
National Hardware V1362 Window Control, Dimensions: 5.61 in L x 1.25 in W x 0.76 in H, Stainless Steel
Wood window sash spring. Steel construction, zinc-plated, 4-7/8 in, upper or lower corner mount, nail on, allows repair of broken sash cords without removing sash, eliminates window rattle.