are they made out of steel or aluminum it says both ?

Mine are made of steel. They tighten down without bending. A nice set of hold down clamps.

Are these M6 size bolts/threads?

They certainly appear to be, since the slots are 8.25mm (0.326") and the threaded screw holes very nearly fill the raised slot-filling boss. It would be easy enough to verify by capturing a vendor photo at 45 degrees and scaling it to normalize the length, then rescaling it by 1.414 to account for the angle. You can then simply measure the hole in the photo directly to get its diameter.

4PCS T-Track Mini Hold Down Clamp Kit, Compatible with 3018-PRO/3018-MX3/3018-PROVer CNC Router Machine

Product ID: 329098634

Details

Brand
Genmitsu
Colour
Metallic
Item dimensions L x W x H
5 x 2 x 4
Material
Zinc-Aluminum
Style
Modern

📏Compact 50x20x56mm size

🔩Zinc-Aluminum Alloy for durability

🛠️Holds materials up to 30mm thick

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Description

🔧 Elevate your CNC game with clamps that mean business!

COMPACT YET MIGHTY - Space-saving 50x20x56mm design that packs a powerful clamping force.
UNIVERSAL T TRACK COMPATIBILITY - Versatile clamp perfect for woodworking, metalworking, and multi-tool setups—expand your creative possibilities.
BUILT TO LAST WITH PREMIUM ALLOY - Crafted from zinc-aluminum alloy for unmatched wear resistance and longevity.
SECURELY HOLDS UP TO 30 MM MATERIAL - Firmly grips a wide range of materials, ensuring flawless workholding every time.
PRECISION FIT FOR GENMITSU 3018 SERIES - Engineered specifically to seamlessly integrate with your 3018-PRO/MX3/PROVer CNC router.

The Genmitsu 4PCS T-Track Mini Hold Down Clamp Kit is a durable, zinc-aluminum alloy clamping solution designed specifically for the Genmitsu 3018 series CNC routers. Compact yet robust, these clamps securely hold materials up to 30mm thick and fit universal T-track systems, making them essential for precise, stable workholding in woodworking, metalworking, and beyond.

Specifications

ASIN	B08H5K2VVK
ASIN	B08H5K2VVK
Brand Name	Genmitsu
Color	Metallic
Customer Reviews	4.5 4.5 out of 5 stars (626)
Customer reviews	4.5 4.5 out of 5 stars (626)
Date First Available	10 September 2020
Item Dimensions	5 x 2 x 4 centimeters
Item Weight	0.2 Kilograms
Item model number	CP50
Manufacturer	Genmitsu
Manufacturer	Genmitsu
Material Type	Zinc-Aluminum Alloy
Model Number	CP50
Product Dimensions	5 x 2.01 x 3.99 cm; 200 g
Style Name	Modern
Tensile Strength	300 Pounds Per Square Inch
UPC	816550023853
Unit Count	4 Count

Reviews

K**L

23.09.2022

S**T

cela me servir tous le temp merci

5.11.2023

B**D

tres bien

13.03.2024

T**S

Buenas pinzas para sujetar piezas en mi impresora CNC. Buenas pinzas

16.08.2025

E**5

Prodotto come da attese ideake per bloccare un pezzo primavdi lavorarlo con la cnc

26.11.2025

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¥7562

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In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

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