Perfect size for miniature lamps that require a chimney but not a shade. Has 11/16 diameter threaded base. Accepts 1-1/8 chimneys. Wick size 3/8 W. Solid brass. NOTE: Some of our acorn burners may have an extra ring that must be unscrewed in order to use Nutmeg Collar. Caution: Always make sure the burner is securely threaded into the lamp base. Use only K1 kerosene or lamp oil and in well-ventilated area. Observe clearances to combustibles. Do not leave a burning lamp unattended. Perfect size for miniature lamps that require a chimney but not a shade Has 11/16 diameter threaded base Accepts 1-1/8 chimneys Wick size 3/8 W Solid brass NOTE: Some of our acorn burners may have an extra ring that must be unscrewed in order to use Nutmeg Collar. Caution: Always make sure the burner is securely threaded into the lamp base. Use only K1 kerosene or lamp oil and in well-ventilated area. Observe clearances to combustibles. Do not leave a burning lamp unattended. UPC 819531028298 ASIN B07NNVJQ75 Color Brass Brand Name Lehman's Unit Count 1.0 Count Item Weight 0.04 Pounds Finish Types Brass Manufacturer China Union Intl Industrial Ltd Material Type Brass