Underwater Kinetics Beamguide Fiber Optic, 20 in/500 mm, 2AAA eLED 513809 20" fiber optic attachement to flashlights for reaching into difficult to see areas Made in USA Great for tight work spaces, circuit boards, bore inspection etc. Compatible with UK Penlight and MPL lights (LED versions only) Dimensions : Light opening : 0.118" - Cap that installs on light : 0.9"