[PREMIUM ACRYLIC MATERIAL] Sturdy and durable, this telescope focusing mask is made of premium acrylic, ensuring a long service life. [VERSATILE COMPATIBILITY] Suitable for various telescopes including reflector, refractor, Dobsonians, Mak Cas, and SCT, offering a wide range of applications. [ANTI-SKID DESIGN] Featuring 3 screw sleeves with anti-skid silicone covers, this plate securely fixes the telescope and prevents slippage, keeping the tubes centered. [EASY FOCUSING] Overcome visual challenges with this focusing plate, providing fast and precise focus adjustments for your telescopes. [LIGHTWEIGHT & BALANCED] At only 28g, the acrylic mask is lightweight and won't disrupt the telescope's balance, ensuring centered installation.